SU1525499A1 - Apparatus for measuring shaft output - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure the power developed by threading equipment of static action. The purpose of the invention is to improve the accuracy of power measurement. A device for measuring power contains a controlled electromagnetic brake, an excitation winding connected to an adjustable power supply unit, a torque sensor and an angular position sensor mounted on the brake shaft, and a measuring unit containing a comparator, three elements And, three triggers, three pulse counters, two pulse generators, two pulse drivers, a decoder, a digital indicator, a NOT element, and a digital-to-analog converter. The introduction of a digital-to-analog converter, a third pulse counter, a second pulse generator, and a second pulse generator to the device for measuring power improves the accuracy of power measurements. 2 Il.

Description

The invention relates to a measurement technique and can be used to measure the power developed by a screwdriving tool of static action.

The purpose of the invention is to improve the accuracy of power measurement.

Fig. 1 shows a functional diagram of a device for measuring power; 2 shows timing diagrams for the operation of the device.

A device for measuring power contains a controlled electromagnetic brake 1, on the shaft 2 of which a torque sensor 3 and an angular position sensor 4 are installed, the excitation winding 5 of the electromagnetic brake 1 is connected to an adjustable power supply unit 6, a measurement unit 7 containing a comparator 8, an output connected the first input of the first element And 9, the second input connected to the output of the first generator 10 pulses, and the output to the counting input of the first counter 11 pulses, the second element And 12 output connected to the counting th input of the second counter 13 pulses, the outputs. through the decoder 14 connected to

digital indicator 15, the first trigger 16, the output connected to the first input of the third element And 17, the second 18 and third 19 triggers, the element NOT 20, the first 21 and the second 22 pulse drivers, digital-analog converter 23, the third counter 24 pulses and the second generator 25 pulses , the information inputs of the digital-to-analog converter 23 are connected to the outputs of the first counter of 11 pulses, and the output to the first input of the comparator 8, the second input of the torque input connected to the output of the sensor 3, the first input of the second element I 12 is connected to the output of the first element I 9, the second input to the output of the first trigger 16, the D input connected to the output of the second trigger 18, the setting S input through the control button 26 connected to the bus Voltage of the logical unit, the output of the third trigger 19 connected to the clock input the first trigger 16, the input to the output of the sensor 4 of the angular position, and the clock input to the output of the second generator 25 pulses, the output of the element NOT 20 is connected to the second input of the third element And 17, the output connected to the counting input of the third counter 24 impulses On the other hand, the output of the high-order bit through the first shaper 21 pulses connected to the installation R-input of the second trigger 18, the output of the second shaper 22 pulses connected to the installation R-input of the first counter 11 pulses, and the output of the third trigger 19o

The power metering device operates as follows.

The shaft 2 of the electromagnetic brake 1 is connected with the thread-screw-in tool 27 under test, the tool and the measurement unit 7 previously set to their initial position (not indicated) are switched on.

In this case, the shaft 2 of the brake 1 comes into rotation and pulses appear at the output of the sensor 4 of the angular position, and the rotation of the shaft 2 at an angle of 3.6 corresponds to one pulse at the output of the sensor 4 of the angular position, and for one revolution of the shaft 2 at the output of the sensor 4 100 pulse0 is formed

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owls from the output of the angular position sensor 4, the pulses arrive at the D input of the trigger 19, and its clock input from the generator output 25 pulses, whose frequency is set to 10 kHz and exceeds the frequency of the pulses from the output of the angular position sensor 4 by several orders of magnitude. In this case, the flip-flop 19 is switched to the unit state by the leading edge of the pulse from the generator output 25 after the pulse 19 comes from the output of the angular position sensor 4 to the D input, and to the zero edge by the leading edge of the generator output 25 after the pulse ends from the output of the sensor 4 angular position.

Then, by adjusting the voltage at the output of the power supply unit, set the required load on the shaft of the test instrument.

At the same time, a voltage appears at the output of the sensor 3, the magnitude of which is proportional to the torque value on the shaft 2 of the brake I. This voltage is applied to the second input of the comparator 8, the voltage of the logical unit appears at its output, the coincidence condition for the element AND 9 starts to be fulfilled, and at its output there appear oscillator pulses lOj whose frequency is set to 50-100 kHz. From the output of the element And 9 pulses of the generator 10 are fed to the counting input of the counter 11 pulses, which counts the number of incoming pulses. Consequently, the voltage at the output of the digital-to-analog converter 23 begins to increase. As soon as the voltage at the output of the digital-analog converter 23 exceeds 5 s (by the value of one step of the reference voltage). The voltage taken from the output of the torque sensor 3, the comparator 8 returns to its original position and turns off the generator 10 from the counting input of the pulse counter 11. At the same time, the number of pulses in the counter 11 is proportional to the torque value on the shaft 2 of the brake 1. The leading edge of the pulse from the output of the trigger 19 periodically resets the contents of the counter 11 and the measurement process repeats again with a pulse frequency of high

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Dztchika 4 stroke angular position. Since the frequency of the generator 10 pulses is 5,000-1,000 times greater than the maximum frequency of the pulses at the output of the angular position sensor A, and the capacity of counter II is 999 pulses, while measuring the torque value of the brake shaft does not exceed the period of the pulses from the output of sensor A angular position.

After the required load on the shaft of the thread-sealing tool being tested is installed, press the control button 26. In this case, the trigger 18 is set to one state, a voltage of logical unit appears at its output, which is fed to the D input of the trigger 16. By the leading edge of the pulse from the output of the trigger 19, the trigger 16 is set to one, the matching condition for the AND element 17 begins to execute and pulses from the output of generator 25 begin to arrive at its input,

Simultaneously with the element AND 17, the conditional coincidence of the N1ND for the element And 12 begins to take place, and the counter input of the counter 13 begins to receive pulses from the output of the element 9, Since the process of measuring the torque on the brake shaft is carried out periodically with a repetition period determined by the frequency of the pulses from the output of the sensor 4 of the angular position, the number of pulses recorded at each moment in time by the counter 13, is proportional to the amount of work, a threading tool with a conepujaer-ioft licn jTyesibiM.

Since the capacitance of the counter 24 is chosen equal to 9999 impulses, and the frequency of the generator 25 is set to 10 kHz, an overflow pulse at the output of the CTapniero discharge of the counter 24 appears 1 second after the flip-flop 16 is set to one.

With the falling edge of the overflow pulse at the output of the higher bit of counter 24, allocated by means of driver 21, trigger 18 returns to its original state, at its output a logical zero is set, which goes to the D input of trigger 16.

The leading edge of the pulse from the output of the trigger 19, the trigger 16 is set to the zero state, the coincidence condition for the elements 17 and 12 ceases to be performed and the counter 13 records the number of pulses proportional to the amount of work performed by the threading tool for 1 s, i.e. power developed by threading tool. The binary-decimal code of the measured power value from the outputs of the counter 13 through the decoder 14 enters a digital indicator for reading. The measurement process is completed. The screwing tool from the power supply is removed from the electromagnetic brake.

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Claims (1)

Invention Formula five 0 five 0 A device for measuring shaft power, containing a torque sensor, mounted) on the brake shaft, and a measuring unit containing a comparator, the output connected HbDt to the first input of the first element And, the second input connected to the output of the first pulse generator, and the output - to the counting input of the first pulse counter, the second element I, output connected to the counting input of the second pulse counter, outputs through a decoder connected to a digital indicator, first trigger, output connected to the first input of the third of the second element And, the second and third triggers, the element NOT and the first pulse shaper, due to the fact that, in order to improve the measurement accuracy, an angular position sensor, an electromagnetic brake, an exciter connected to an adjustable power supply unit, digital - the tax converter, the third pulse counter, the second pulse generator, the second pulse generator, the information inputs of the digital-analog converter are connected. the outputs of the first pulse counter, and the output to the first input of the comparator, the second input connected to you, the torque sensor's stroke, the first input of the second element I connected to the output of the first element II, and the second input to the output of the first T11igger, D- OUTPUT connected to the the second trigger, the setting S-input through the control button of the logical voltage connected to the bus, the output of the third trigger is connected to the clock input of the first trigger, the D input to the output of the angle position sensor, and the clock input to the output of the second pulse generator, the element output is NOT connected to the second input of the third element I, the output connected to the counting input of the third pulse counter, the output of the higher bit through the pulse shaper connected to the installation R input of the second trigger and, second pulse shaper output is connected to the installation R-input of the first pulse counter, and the input - to the output of the third flip-flop. ti.1 Chsh f / fn "at In